Is it possible to enter PHP as data in a web viewer? I can open a PHP document on another server and have it execute, but I'd like to store the PHP code as calculated data. So far Im having no luck. I've tried pasting the following:

"data:text/html,<?php echo 'hello world!'; ?>"

But the web viewer just ends up being blank.

... no.

You need a webserver and a PHP parser for php to be processed.

PHP is included in OS X but disabled by default

Here's Apple's documentation on enabling it

http://docs.info.apple.com/article.html?path=ServerAdmin/10.4/en/c3ws29.html

and Filemaker's http://filemaker.custhelp.com/cgi-bin/filemaker.cfg/php/enduser/std_adp.php?p_faqid=6537&p_sid=j*6gSi3j&p_lva=6436

Using the API may also require some tweaking to the default PHP install. The online PHP documentation is really quite good.

http://us3.php.net/manual/en/